[Anon] Imperium - Adeptus Astartes - Salamanders: It says roster requires a warlord but it doesn't tell me how to assign a unit as a warlord?

[NewRecruitAnon]

Problem: It says roster requires a warlord but it doesn't tell me how to assign a unit as a warlord?

Expected: I thought the link from roster or warlord would let me actually fix the problemm

List: https://www.newrecruit.eu/app/list/WfFDa

[Mad-Spy]

Pick any valid character and check the box marked "Warlord".